–noun
1. deliberately mischievous or non-malicious modification of property: fandalism of public buildings. With intent of showing appreciation of said property.
2. the conduct or spirit characteristic of the fandals.
3. willful or ignorant alteration of artistic or literary treasures with view for appreciation or correction.
4. a fandalic act.

Person 1: Who's wrote on our sign!?
Person 2: Must be a fan, look at it
Person 1: "We love you.." but they're wrote all over it! it looks a mess!
Person 2: Aww, bless. Such fandalism.